package com.heima.media.interceptor;

import com.heima.common.dto.User;
import com.heima.common.util.MediaThreadLocalUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author zsk
 * @create 2022-04-12-16:40
 */
public class UserInterceptor implements HandlerInterceptor {


    /**
     * 前置拦截
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //获取存在请求头中的userId
        String userId = request.getHeader("userId");

        //判断，如果不为空，将userId放入到线程中
        if (!StringUtils.isEmpty(userId)) {
            User user = new User();
            user.setUserId(Integer.parseInt(userId));
            //设置到线程中
            MediaThreadLocalUtil.set(user);
        }
        //放行(无论是否包含都放行，后续会有其他请求不需要登录也可以做)
        return true;
    }

    /**
     * 后置拦截
     *
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        //删除线程内userId
        MediaThreadLocalUtil.remove();
    }
}
